<template>
  <el-container class="home-container">
    <!--头部区域-->
    <el-header>
      <div>
        <img src="../assets/heima.png" alt="" >
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout" size="mini">退出</el-button>
    </el-header>
    <!--页面主体区域-->
    <el-container>
      <!--侧边栏-->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <!--侧边栏菜单区域-->
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <el-menu
            background-color="#333744"
            text-color="#fff"
            active-text-color="#409fff"
            unique-opened
            :collapse="isCollapse"
            :collapse-transition="false"
            router
            :default-active="activePath">
          <!--一级菜单-->
          <el-submenu :index="item.id.toString()" v-for="item in menulist" :key="item.id">
            <!--一级菜单的模板区-->
            <template slot="title">
              <!--图标-->
              <i :class="iconsObj[item.id.toString()]"></i>
              <!--文本-->
              <span>{{ item.authName }}</span>
            </template>
            <!--二级菜单-->
            <el-menu-item :index="'/'+subItem.path" v-for="subItem of item.children"
            :key="subItem.id" @click="saveNavState('/'+subItem.path)">
              <i class="el-icon-menu"></i>
              <!--文本-->
              <span>{{ subItem.authName }}</span>
            </el-menu-item>
          </el-submenu >
        </el-menu>
      </el-aside>
      <!--右侧内容主体-->
      <el-main>
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>

</template>

<script>
export default {
  name: "Home",
  data() {
    return {
      //左侧菜单数据
      menulist: [],
      iconsObj: {
        '125' : 'iconfont icon-user',
        '103' : 'iconfont icon-tijikongjian',
        '101' : 'iconfont icon-shangpin',
        '102' : 'iconfont icon-danju',
        '145' : 'iconfont icon-baobiao'
      },
      //是否折叠
      isCollapse: false,
      //被激活的链接地址
      activePath: '',
    }
  },
  created() {
    this.getMenuList();
    this.activePath = window.sessionStorage.getItem('activePath');
  },
  methods: {
    logout() {
      //清空sessionStorage
      window.sessionStorage.clear();
      //重定向到登录页
      this.$router.push('/login');
    },
    //获取所有的菜单
    async getMenuList() {
      const { data : res} = await this.$http.get('menus')
      if(res.meta.status !== 200) return this.$message.error(res.meta.msg);
      this.menulist = res.data;
    },
    toggleCollapse() {
      //点击按钮，切换菜单的折叠与展开
      this.isCollapse = !this.isCollapse
    },
    //保存链接的激活状态
    saveNavState(activePath) {
      window.sessionStorage.setItem('activePath',activePath);
      this.activePath = activePath;
    }

  }
}
</script>

<style lang="less" scoped>
  .home-container {
    height: 100%;
  }
  .el-header {
    padding-left: 0;
    background-color: #373d41;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: #fff;
    font-size: 20px;
    > div {
      display: flex;
      align-items: center;
      span {
        margin-left: 15px;
      }
    }
    img {
      width: 50px;
      height: 50px;
    }
  }
  .el-aside {
    background-color: #333744;
    .toggle-button {
      background-color: #4a5064;
      color: #fff;
      text-align: center;
      font-size: 10px;
      line-height: 24px; //行高
      letter-spacing: 0.2em;
      cursor: pointer;
    }
    .el-menu {
      border-right: none;
    }

    .iconfont {
      margin-right: 5px;
    }
  }
  .el-main {
    background-color: #EAEDF1;
  }

</style>
